Slow-combustion fuse for projectiles



June 23, 1925.

o. OESTERLEN ET AL SLOW COMBUSTION FUSE FOR PROJECTILES Filed Dec. 6, 1920 June 23, 1925,

GTTO OESTER-LEN, OF ESSEN, AND KARL WIESER, OF WEB/DEN, GER-MANY, ASSIGNO'RS TO FRIED. KRUPIP AKTIENGESELLSCHAFT, OF ESSEN-ON-TI-IE-RUHB, GERMANY.

SLOW-COIIIBUSTION FUSE FOR PROJECTILES.

Application filed December 6, 1920. Serial No. 428,740.

(GRANTED UNDER THE PRGVISIQNSDF THE ACT OF MARCH 3, 1921, 41 STAT. .I.., 1313.)

T0 aZZ whom it may concern:

Be it known that we, OTTO. OESTERLEN, residing at Essen, Germany, and KARL lVIEsER, residing at Verden, Ruhr, ermany, both citizens of the Republic of Germany, have invented a certain new and useful Improvement in Slow-Combustion Fuses for Projectiles (for which we have filed application in Germany, August 31, 1918), of which the following is a specification.

It has been found that the burning compositions of the ordinary slow combustion fuses burn away more slowly than is intended or that under some circumstances the combustion ceases altogether as soon as the fuses are used on projectiles which are fired at a high velocity or reach heights in their flight at which there is only a very small air pressure. Thisinvention relates to a slow combustion fuse which obviates this disadvantage in a simple manner.

The invention will be described with reference to the accompanying drawings which show a construction of the fuse according to this invention the same being shown in axial longitudinal section.

A denotes the body of the fuse and B the fuse rings of the slow combustion fuse which contain the burning composition Z)". In the body A of the fuse is movably mounted a firing plunger C adapted to ignite the burning composition 5 and containing a primer 0 and enclosed by a holder D of Ushaped formation. To a cylindrical extension (4 of the body A of the fuse is screwed a plate E, which carries a substantially conical shaped cap 6 mounted coaxially with the longitudinal axis of the fuse. To the plate E is rigidly attached an approximately conical shaped hollow cap E the longitudinal axis of which coincides with the longitudinal axis of the fuse. This cap E has on its upper end a circular through aperture e the centre point of which lies in the axis of the fuse. The hollow conical shaped annular space, which is formed by the cap E and e communicates through a boring e in the plate E with a passage a in the body A of the fuse running parallel with the axis of the latter, and from which a passage arranged obliquely to the axis of the fuse leads to the burning composition 6 The passages b and a the boring e and the annular space 6 with the opening a constitute the only means of connection between the burning composition b and the outer air. This passageway 6 c 6 0 ,0 opens to the air in the direction of the longitudinal axis of the fuse.

After the projectile has been fired the air which is contained in the hollow space 6 a 0 e undergoes considerable compression under the influence of the progressive velocity of the projectile, and the point at which the burning composition burns away, is therefore always under considerable pressure. As the opening 6 of the hollow space 5 c 6 e is located in the centre of the fuse and the point of combustion is farthest away from the centre, the centrifugal force which the air contained in the hollow space is subjected t0,also acts in a direction, which increases the pressure at the point of ignition. The action of the pressure produced at the point of ignition in'the manner described has the advantage that too sluggish a combustion or even the extinction of the burning composition is eliminated witlr certainty and moreover even when the projectile has a very high speed of rotation or when a height is reached at which there is only a very small air pressure.

Claims.

1. A slow combustion fuse for projectiles comprising a body provided with a cylindrical extension, fuse rings carrying a slow combustion fuse secured to said body, a firing pin mounted in said extension, a plate screW-threadedly engaging said extension and provided with a cap, a conical hollow cap open at its front end and centrally thereof screw-threadedly engaging said plate and forming with said first mentioned cap a hollow conical-shaped annular space, said body and fuse rings being formed with a passage-way providing communication between said annular space and said burning composition of the combustion fuse.

2. A slow combustion fuse for projectiles comprising a body, a cylindrical extension projecting from said body, fuse rings con taining a slow combustion fuse secured to said body, a plate screw-threadedly engaging said extension, a coneshaped cap proj ectingfrom saidpl-at'e, a cone/shaped hollow member attached to said plate and provided with an opening in the direction of I the longitudinal axis of the fuse, said hollow member and cap forming a conical-shaped annular space, said body and fuse rlngs hav-* ing formed therein apassage 'way providing communication between; said annular, space and the burning composition of the fuse.

3. A slow combustion'fuse forprojectiles comprising a body, a cylindrical extension formed onsaid loody, fuse rings containing a combustion fuse secured to said ="body," a' firing pin mounted in said extension, a plate provided with a conical'shaped cap secured to said extension, said cap covering said firing pin, a frus'to-conicalshape hollow member secured to said plate, the free end of said member being open and disposed centrally of the fuse, said cap and hollow member for mi irg hollow conical-shaped composition of the-device, a cap secured to 'sa1d body,*a hollow member secured to said body and open at itsffr'ee endicentrally of the de'v1ce,-sa1d*c{ap andhollow-member to 'gether forming-an annular space which lS inclined outward ly from theopen end *of said member, said-* bo'dy' and fuse 'ri g being provldedwrth a passage way aifordin'gcommunication between' sa'id annular space and the burning composition of the fuse.

5. A slow combustion fuse for projectiles comprising a main 'body secured to a part of the body of the projectile, afu's'e ring'being rotatably mounted on the fuse body *o'utside way which opens straight into t-heair space essentially in' the direction of the longitudinal axis of the fuse. 7 6. A slow combustion fuse for projectiles comprising a main body secured to a part of I the body of the projectile, a fuse ring rotatably mounted on the fusebody outside said part of the body of the projectileand a slow combustion composition carried 'by said fuse. ring, said composition communicating with the. outerxairispace only by a passage-way which opens straight into; the :air spacein the: center of front surface of the fuse. 7; A slow combustionrfuse for projectiles comprising a mainbody secured to a :part of the body *of the projectile, said fuse body being formed with a centralkextension provided with a .hollowlspa'oe, a fuse ring ro tatably mounted on the fuse body outside said part of the body of the projectile, a. slow-combustion composition carried by said fuse ring, a "firing plunger located in the hollow space of said central extension for igniting said composition, a conical cap cov ering the hollow space of said extension, and a conical hollow cap arranged on the front end ofthe fuseand forming witlrsaid first mentioned cap :a hollow 'conical slrap'ed annular-space, said-slow combustion composition co'rnmu'nicati ng with the outer air space.

onlyby a passageway Whichopens into said hollow'conical-shaped annular space. The foregoing specification signed at sen,- 'Germa ny, this 24th day-of June, 1920;

co rro 'OESTERLENQ v KARL YVIESEB'. In presence of+ 7 HANS GOTTSMANN, "Josue 'OLBERT-Z. 

